Spore and pollen assemblages of the Upper Cretaceous Hakobuchi group in Hokkaido, Japan

Abstract

Many spores and pollen of the Upper Cretaceous Hakobuchi group (Campanian and Maestrichtian) in Hokkaido are reported. The range of their appearance and the biostratigraphic classification are illustrated in the text-figure. The geographic distribution of Schizosporis, Phyllocladidites, and Aquilapollenites is discussed in comparison with the spore and pollen assemblages of the circum-pacific regions. Aquilapollenites seems to play a important role in the correlation of the Upper Cretaceous deposits in the circum-pacific areas including Siberia of north of 40N. Lat.at least.